CODEWITHSUNDEEP
c#.netmultithreading
user679530
user679530

Reputation: 917

How can I make a thread safe dictionary

I have a dictionary which I want to make it static. For suppose I have a dictionary which has some data.If I am accessing this dictionary by two processes at the same time then my data mismatches. How can I solve this problem.

for example In a dictionary I have key A- values 1 2 3 4 5 key B- values 6 7 8 9 10

When I am accessing this dictionary by two processes one reads data for A and other reads data for B. Then I have results sets where B contains A values.

Upvotes: 0

Views: 752

Answers (3)

Alexandre TRINDADE
Alexandre TRINDADE

Reputation: 947

You just need to use a ConcurrentDictionary, in System.Collections.Concurrent

private static readonly ConcurrentDictionary<TKey, TValue> dictionary = 
    new ConcurrentDictionary<TKey, TValue>();

Upvotes: 1

mousio
mousio

Reputation: 10337

If your program is written in .NET, you can take a look at this related question regarding the best way of implementing a thread-safe Dictionary, with links and C# sample code…

Upvotes: 0

Tom W
Tom W

Reputation: 578

If your program is written in Java, you need to synchronize any methods that retrieve and set the values.

For example:

public synchronized int getValue() {
    return value;
}

The 'synchronized' keyword ensures that two processes do not read or set data concurrently.

This is achieved by the JVM acquiring a lock on the object, to only allow one thread to access it at a time. The code is then executed, and once completed the lock is released. If another thread is waiting, this thread can then acquire a lock on the object.

Upvotes: 0

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